Organic light emitting display
First Claim
1. A unit pixel for an organic light emitting display, the unit pixel comprising:
- first to fourth transistors;
a capacitor coupled to one of the first to fourth transistors,wherein two of the first to fourth transistors function as switching devices, one of the first to fourth transistors functions as a driving device, and one of the first to fourth transistors functions as a diode device, andwherein the one transistor functioning as the diode device is connected directly to a data line, but not directly to a scan line;
an organic light emitting diode (OLED); and
a fifth transistor connected between the fourth transistor and the OLED to prevent a current from the fourth transistor from flowing to the OLED during an initialization.
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Accused Products
Abstract
An organic light emitting display that is capable of preventing degradation of picture quality, and a method of manufacturing the organic light emitting display are provided. A unit pixel for the organic light emitting display, includes a first transistor coupled to a data line and having a first voltage threshold, a second transistor coupled to the first and third transistors and controlled by a second select signal, a third transistor coupled to the first transistor and controlled by a first select signal, and a fourth transistor coupled to the third transistor and having a fourth voltage threshold such that a drive current of the fourth transistor is controlled independent of the fourth voltage threshold.
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Citations
42 Claims
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1. A unit pixel for an organic light emitting display, the unit pixel comprising:
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first to fourth transistors; a capacitor coupled to one of the first to fourth transistors, wherein two of the first to fourth transistors function as switching devices, one of the first to fourth transistors functions as a driving device, and one of the first to fourth transistors functions as a diode device, and wherein the one transistor functioning as the diode device is connected directly to a data line, but not directly to a scan line;
an organic light emitting diode (OLED); and
a fifth transistor connected between the fourth transistor and the OLED to prevent a current from the fourth transistor from flowing to the OLED during an initialization.
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2. A unit pixel for an organic light emitting display, the unit pixel comprising:
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a first transistor coupled to a data line and having a first voltage threshold; a second transistor coupled to the first transistor and a third transistor and controlled by a second select signal; the third transistor coupled to the first transistor and controlled by a first select signal; a fourth transistor coupled to the third transistor and having a fourth voltage threshold, wherein a drive current of the fourth transistor is controlled independent of the fourth voltage threshold, and wherein the first transistor functions as a diode device and is connected directly to a data line;
an organic light emitting diode (OLED); and
a fifth transistor connected between the fourth transistor and the OLED to prevent a current from the fourth transistor from flowing to the OLED during an initialization. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An organic light emitting display device comprising:
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a plurality of unit pixels, each unit pixel including, a first transistor coupled to a data line and having a first voltage threshold, a second transistor coupled to the first transistor and a third transistor and controlled by a second select signal, the third transistor coupled to the first transistor and controlled by a first select signal, a fourth transistor coupled to the third transistor and having a fourth voltage threshold, wherein a drive current of the fourth transistor is controlled independent of the fourth voltage threshold, and wherein the first transistor functions as a diode device and is connected directly to a data line, an organic light emitting diode (OLED), and a fifth transistor connected between the fourth transistor and the OLED to prevent a current from the fourth transistor from flowing to the OLED during an initialization. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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24. A display device comprising:
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a first transistor connected to a first node to initialize the first node in response to a first select signal, the first transistor having a first threshold voltage; a second transistor connected between the first node and a second node to initialize the second node in response to a second select signal; a third transistor connected to the first node to supply a data voltage to the second node, the data voltage being dropped as much as the first threshold voltage; a fourth transistor connected to the second node to supply a driving current to an organic light emitting diode (OLED), the fourth transistor having a second threshold voltage to offset the first threshold voltage, wherein the first threshold voltage of the first transistor is identical to the second threshold voltage of the fourth transistor, and the first transistor functions as a diode device and is connected directly to a data line; and
a fifth transistor connected between the fourth transistor and the OLED to prevent a current from the fourth transistor from flowing to the OLED during an initialization operation. - View Dependent Claims (25)
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26. A unit pixel for an organic light emitting display, the unit pixel comprising:
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a first component coupled to a data line; first and second select signal lines to supply respectively first and second select signals; a second component coupled to the first component and controlled by the second select signal; a third component coupled to the first component and controlled by the first select signal; a fourth component coupled to the third component and supplying a driving current to an organic light emitting diode (OLED), wherein the first component is connected directly to the data line, but not directly to any of the first and second select signal lines; and
a fifth component connected between the fourth component and the OLED to prevent a current from the fourth component from flowing to the OLED during an initialization operation. - View Dependent Claims (27, 28)
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29. A method of manufacturing an organic light emitting display device, the method comprising:
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forming an organic light emitting display panel including a plurality of unit pixels, each unit pixel including, a first transistor coupled to a data line and having a first voltage threshold, a second transistor coupled to the first transistor and a third transistors and controlled by a second select signal, the third transistor coupled to the first transistor and controlled by a first select signal, a fourth transistor coupled to the third transistor and having a fourth voltage threshold such that a drive current of the fourth transistor is controlled independent of the fourth voltage threshold, wherein the first transistor functions as a diode device and is connected directly to a data line, an organic light emitting diode (OLED), and a fifth transistor connected between the fourth transistor and the OLED to prevent a current from the fourth transistor from flowing to the OLED during an initialization operation. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification